Preparation method of silane crosslinked ethylene-vinyl acetate copolymer adhesive film

Abstract

The invention discloses a preparation method of a silane crosslinked ethylene-vinyl acetate copolymer adhesive film, which comprises the following steps: evenly mixing a composition, extruding, casting, cooling, drawing, and coiling to obtain the silane crosslinked ethylene-vinyl acetate copolymer adhesive film, wherein the extruding processing temperature is 100-150 DEG C; and the composition comprises the following components in parts by mass: 100 parts of ethylene-vinyl acetate copolymer, 0.1-2 parts of silane coupling agent A, 0.1-2 parts of silane coupling agent B and 0.01-0.2 part of organic peroxide. According to the invention, silane crosslinking is late crosslinking, crosslinking reaction does not need to be performed in a laminating machine, and the packaging of an assembly can be finished by simply pressurizing for 5-8 minutes under conventional treatment conditions in the vacuum laminating machine, thus greatly improving the laminating efficiency and saving the production cost.

Description

technical field [0001] The invention relates to a preparation method of a silane-crosslinked ethylene-vinyl acetate copolymer adhesive film. Background technique [0002] At present, solar power is becoming the most important new energy. Solar cells are the core part of the solar power generation system, and also the most valuable part of the solar power generation system. The quality and cost of solar cells will directly determine the quality and cost of the entire system. [0003] The conventional solar cell packaging structure is as follows: the upper layer is tempered glass, the middle layer is the cell, the lower layer is the back sheet, and there is one or two layers of ethylene vinyl acetate copolymer film between the glass and the cell, and between the cell and the back sheet (EVA film) firmly bonds the various layers of materials. EVA film is an important packaging material for solar cells. In order to ensure the long-term effective outdoor work of the packaged s...

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Problems solved by technology

[0006] However, practical applications have found that the above-mentioned peroxide-crosslinked EVA film has the following problems: (1) due to the addition of a large amount of organic peroxide and auxiliary cross-linking agent, it is easy to promote the yellowing of the EVA film, and due to the EVA glue The yellowing of the film causes the power of the module to drop. In addition, a large amount of organic peroxides decompose to produce small molecules that are prone to bubbles and affect product quality; (2) Since the ethylene vinyl acetate copolymer resin undergoes a crosslinking reaction during the lamination process, Therefore, in order to ensure a certain degree of cross-linking, the lamination time is longer (generally 10-13 minutes), which leads to the disadvantages of low production efficiency; (3) due to the addition of a large amount of organic peroxides and auxiliary cross-linking agents, in During the production process of EVA film, the production and processing temperature should be strictly controlled not to exceed 90°C, otherwise it is very easy to produce rubber material, resulting in losses such as production stoppage and material scrapping, so the process conditions are relatively harsh.

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